<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <script>
      // 键盘事件；
      document.onkeydown = function (e) {
        // var code = e.keyCode; //ASSCI码 ：废弃
        var key = e.key;
        // console.log(e.shiftKey,key);

        // if(e.shiftKey && key=="C"){
        //     console.log("按下了 shift+ c按键");
        // }

        switch (key) {
          case "f":
            if (e.altKey) {
              console.log("按了alt + f键");
            }
            break;
          case "b":
            if (e.ctrlKey) {
              console.log("按了b+ctrl按键");
            }
            break;
          case "C":
            console.log(e.shiftKey);
            if (e.shiftKey) {
              console.log("按了c+shift按键");
            }
            break;
          default:
            console.log("按了除了a和b的按键");
            break;
        }
      };
    </script>
  </body>
</html>
